A means of transmitting XML data as a continuous stream over a network connection, used by the Jabber open-source instant messaging system. What others might think of as an "XML document" represents an entire "side" of an XML Stream conversation, from start to finish.

XML Streams always begin with a <stream:stream> tag, identifying the stream namespace and the default namespace of the stream's contents. They end with a </stream:stream> tag, which tells the process on the other end of the connection that it's now OK to close the stream connection. All streamed XML data is logically contained within the <stream:stream/> element.

The <stream:stream> tag may also contain a session ID, which may be used by the client to perform digest authentication.

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